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Acetylation of histones 3 and 4 on the human β-globin locus in A181γ cells. Chromosome DNA was precipitated with antibodies against acetylated histones 3 and 4. The acetylation of histones 3 and 4 before and after induction was represented by the ratio of band intensity of PCR products from 25 cycles on agarose gel stained with ethidium bromide amplified from immunoprecipitated chromosome DNA to that of input DNA. ▪, induced; □, uninduced.
